| http://www.w3.org/ns/prov#value | - in heteroatoms, such as S, N and/or O, may also be mono-substituted or polysubstituted and/or may be further fused, [0029] R??? and R??? are each, independently of one another, H or C1-C4-alkyl, where one or two CH2 groups may also be replaced by C???O, [0030] Ar is an unsubstituted or monosubstituted or polysubstituted aromatic ring or fused ring system having from 6 to 18 carbon atoms, in which,
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